Patent US2252798A successfully refreshed from Google Patents.
US3231518A
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Attrition resistant siliceous catalysts and method of preparation thereof
Assignee: Sunoco Inc
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Filing: 1964-07-09
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Granted: 1966-01-25
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Expires: 1984-07-09
Abstract
No abstract record available.
Inventors
- 👤 George L Church
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:25
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/16; B01J33/00; B01J37/00; B01J37/04; Y; Y10; Y10S; Y10S502/00; Y10S502/50; Y10S502/504
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
A CATALYST PELLET OF FROM 4 TO 15 MM. IN AVERAGE DIAMETER CONSISTING ESSENTIALLY OF ATTRITABLE SILICEOUS CATALYTIC MATERIAL HAVING PARTICLES OF A GREATER HARDNESS THAN SAID ATTRITABLE SILICEOUS CATALYTIC MATERIAL POSITIONED IN SAID PELLET ADJACENT TO SURFACE THEREOF; SAID PARTICLES HAVING AN AVERAGE DIAMETER OF AT LEAST 0.5 MM.
Claim 2
Dependent Claim
50 words
A CATALYST PELLET OF FROM 4 TO 15 MM. IN AVERAGE DIAMETER CONSISTING ESSENTIALLY OF ATTRITABLE SILICEOUS CATALYTIC MATERIAL HAVING PARTICLES OF A GREATER HARDNESS THAN SAID ATTRITABLE SILICEOUS CATALYTIC MATERIAL POSITIONED IN SAID PELLET ADJACENT TO SURFACE THEREOF; SAID PARTICLES HAVING AN AVERAGE DIAMETER OF AT LEAST 0.5 MM.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-24 | 1969-07-26 | 1970-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-24 | 1973-07-26 | 1974-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-24 | 1977-07-26 | 1978-01-25 | $7700.00 | Window Closed / Lapsed |